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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8bd3afbababf73d5ba169e90511afb3e59aa63a3aa9e64b226fe5c34d7e7c8' 
  AND token = 'bmvFjiMNxsnSTcUuTO2bwaaK6j8WOrdgwJb0Fm/GwWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}